Question

Which of these systems of equations has a solution of (6,−7)?
A
x−2y=20
2x−y=19
B
x−2y=20
2x+y=19
C
x+2y=20
2x−y=19
D
x+2y=20
2x+y=19

Answer 1

B

When x=6 and y=-7:

6 - 2(-7) = 20
2(6) + (-7) = 19